// This is the command sequence that rotates the ST7789 driver coordinate frame

writecommand(TFT_MADCTL);
rotation = m % 4;
switch (rotation)
{
case 0: // Portrait
#ifdef CGRAM_OFFSET
    if (_init_width == 135) {
        colstart = 52;
        rowstart = 40;
    } else {
        colstart = 0;
        rowstart = 0;
    }
#endif
    writedata(TFT_MAD_COLOR_ORDER);

    _width  = _init_width;
    _height = _init_height;
    break;

case 1: // Landscape (Portrait + 90)
#ifdef CGRAM_OFFSET
    if (_init_width == 135) {
        colstart = 40;
        rowstart = 53;
    } else {
        colstart = 0;
        rowstart = 0;
    }
#endif
    writedata(TFT_MAD_MX | TFT_MAD_MV | TFT_MAD_COLOR_ORDER);

    _width  = _init_height;
    _height = _init_width;
    break;

case 2: // Inverter portrait
#ifdef CGRAM_OFFSET
    if (_init_width == 135) {
        colstart = 53;
        rowstart = 40;
    } else {
        colstart = 0;
        rowstart = 80;
    }
#endif
    writedata(TFT_MAD_MX | TFT_MAD_MY | TFT_MAD_COLOR_ORDER);

    _width  = _init_width;
    _height = _init_height;
    break;
case 3: // Inverted landscape
#ifdef CGRAM_OFFSET
    if (_init_width == 135) {
        colstart = 40;
        rowstart = 52;
    } else {
        colstart = 80;
        rowstart = 0;
    }
#endif
    writedata(TFT_MAD_MV | TFT_MAD_MY | TFT_MAD_COLOR_ORDER);

    _width  = _init_height;
    _height = _init_width;
    break;
}
